TrackLink
USBL tracking systems are highly robust and accurate
positioning systems. The merits of the Broadband Acoustic
Spread Spectrum technology can be easily demonstrated in a
simple water tank test at LinkQuest's San Diego factory.

The
following is the result of a test in a 2 meters by 2 meters cylindrical
water tank. The transceiver is placed at the center of the
water tank 60 cm below water surface while the transponder
is placed about 30 cm below the transceiver with 65 cm of
the horizontal distance. The TrackLink system is configured
in standard Transponder mode. It is the most popular mode
used by end customers.

Over
3000 interrogations were recorded. The figure below shows
the trail of the target (transponder address 1) of most
recent 3000 points. This point has hardly moved in such a
severe multipath (reverberated) environment.

Standard
deviation of the bearing for this entire period: 0.10
degrees